| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric coil for water cooling that can prevent water leakage to the part between yarn stocks, even when gap corrosion occurs at the metal joint part between a coil winding conductor and a box for supplying and draining liquid, and has superior water resistance, and its manufacturing method. SOLUTION: Water-resistant resin is used as the sealing material of hollow and solid yarn stocks 5 and 6 for composing a coil winding conductor 2. The water-resistant resin is a thermosetting resin having no ester bonds in molecule structure, such as amine-curing-type epoxy resin, phenol-curing type epoxy resin, or amine-salt-catalyst curing type epoxy resin, thus improving the water resistance between the yarn stocks. More specifically, the sealing material between the yarn stocks is hard to undergo hydrolysis, even when gap corrosion occurs at the metal joint party between the coil winding conductor and a box for supplying and draining liquid, thus preventing leakage water between the wires from penetrating and progressing, preventing ground insulation from deterioration due to moisture and heat by the leakage water, and lowering the insulation performance of the ground insulation will not occurs.
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